height·en 
/ˈhaɪtn̩/ verb
height·ens; height·ened; height·en·ing /ˈhaɪtn̩/ verb : to increase the amount, degree, or extent of (something) : increase [+ obj] ▪ The plan will only heighten tensions between the two groups. ▪ This tragedy has heightened our awareness of the need for improved safety measures. [no obj] ▪ Tensions between the two groups have heightened.
— heightened adjective
▪ The meeting now has heightened [=more, greater] significance.
▪ The meeting now has heightened [=more, greater] significance.
